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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b34e4694da4920c1391d5df195918978a13ee9182778c141dbaaaf90294464f' 
  AND token = 'ab6s6vZ+7isILfaoBIS/XRY3OFxkqrbKQXH1u8dVArs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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