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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '910c13c00c852f33a095ab1289a0c192e45ffdb2d19e984ac9621a9d706c3d51' 
  AND token = 'Q+hSCP7o6s/h/Omz2R9tL5Pnv5taSaRvbVR6nywl0DY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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