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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20ed9594623a1403722277e7fc1c4f65fedb0732ff2519f8639092dfc45d6226' 
  AND token = 'DpA4tq3+6jZNFV10wvdQgRtjZk91avpu7wlstxraFBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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