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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58d73c4b9e1590939b3c2a92f0d0fb06064d1f90a2d359fc758fcebf9256e596' 
  AND token = 'tsFuBPtX07cT88BK9We7cZf92owHAPOuw3t+F/1E3+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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