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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67322a660904d088fe92190f9683089f2a0bcebc0de166a5b209121e84112f8c' 
  AND token = 'NoB7yyEVsmHBXH0CHCcd/oQa2sXXn0rHPkFQJsG+930=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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