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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2c1a6850b5396a856dd6f4f5aba51439a2601d31bb73353fb90f0a672dc0103' 
  AND token = 'QO4vCUmgaxNH+NNTsuDc3smseOGX2524ICrnGGkcB04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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