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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96d01847bb25c0043bddeadf6b0b5490e84bfc8e55261e5b0da3eca7c55b2bc6' 
  AND token = 'uhEYPii2hXAt2LvTXB7U1993pjMnGhPdcNMj2d0Eu48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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