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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '036388d51b6537964d8243b9f762bc64b66bea7b07d38844883af09a927805db' 
  AND token = 'iEYQGH0JuDV0Tqs+igmpj01xIL4skeRWCscMbR5FI48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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