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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6888310cdb7bbd0ca86160bb825970291bf35a44a8fff73824c188b0b18de782' 
  AND token = 'kwlZfVF3Q1jwQAPKNEJcjQF0XJvELdq9V2ymgauFExk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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