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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '304d1538b8a188018fd6186236513bbe510df9ba1da3b34caaa1b71a9e2d03a1' 
  AND token = 'B+zdDDwB+MO7ewGhb0c1aMnxsmsZ8TrtIbb60wryQSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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