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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7066ad9e51b706111b93d8a0f2a241f41b164050cfa259337f0f86f920d88d63' 
  AND token = '+KxUrfyJt+RPRtqbULF+jgW7ocXNA+IqxPX1uuAqoL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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