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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c35d44b833d45da05e856eff4302a2f8a6766f12de06fe7807d8cc0b59f50667' 
  AND token = 'Jfhpfeym59Uj3kIK1Lo5OLxgL2dPJJvvjpMRvlb30A4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}