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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75e2bdd10a6e15b43b6bbc4a0a8c0006c0d9806ee192c8cbc5c5ff66085987ed' 
  AND token = 'OVOM3Fy5gg22hZwZjk1isL5u2e7roeXNK0j0HrLqXwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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