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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e5cb123d47dddd0236ae5c27f7a9abc84ecb0547d5a359952ff75ba5b71e95d' 
  AND token = 'Pr5JLUaw9uvXvM0b21tY6KgeYPIPc9pMdAx1hwdc2Jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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