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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b05cadc4fa1b10c956cb7874691a3118a2e552795e951e69260c44313b726ba' 
  AND token = 'FoR5181Wb0s59wdglRw0cCH+mC8fqFdLc3QtQSFODhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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