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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '630dd6595a2a5eec3f7e575c734305c29af1786237c67581181e73808ed95395' 
  AND token = '/JWaSzBoKbHg/htsDWbWavri92P1wmnKNcosYKr8V5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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