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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '074a1779a1763ee089d3282236843474e58737d5766326695e3ccab7ad6460fe' 
  AND token = 'Ve9HqsHDfq/5yABsKgwZVCuTCUlfsWrPbx7aw1I8MSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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