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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb2a2f86d318c9a2f495c03f5d5908eb5eb8aca58f7415aef80f3662eb717b9a' 
  AND token = 'M4AKXot5yBWnkFzurIRZSbxfs4U5sby9gyCMN1bwSts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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