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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f981c625afa794a8d3c6266cde1c25aad3c6964608feaf3f3e9d576a0aba09fc' 
  AND token = 'smWV0nR5c1QuRDTyqUmIabNkgE9KJhAdaKvBaaA4kms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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