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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2553bc7ce7569e20085bf126f915d6c5bf2b501b94c3df057d661c87883502e' 
  AND token = 'xQN3zYqjRBcNc6Rd8FeVR/sBE0gxw2gIOWZt64KTRgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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