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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '551424242dddd4a02888d92d18042ded6450bdd4d1ac6d8b811a398d3f043890' 
  AND token = '+Z5w5l17VngJx7hsM/+YQ49PZnGHDOfVoLpR/zQ8Hyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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