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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8ebb88fb7cde6c34293c038b2956388fb647442d751eb614f2d747e0ccdf7a3' 
  AND token = 'g5FM7Huh/okS32fvT+sF1ju4GpZL6tt91tinkjQwNV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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