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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0069c85accafff52d1d6b1817c8ed73aa40c8bcfd8f0c319470e4f704279013c' 
  AND token = 'qGcNXEsecamPBRSErglhMv2fV6YwqPvNYRFzxfmYh08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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