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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37d1b0815689fada78858af2d658c61f2341feadc8278dd334c85183073e074c' 
  AND token = 'T/FukrHC3QVPji6j+nl35nmamdAZRBQLOMu50HyQ7pM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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