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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94c1522a67d0e1777c39600186c18d6cab26da40c6036c348f92499e65609ff4' 
  AND token = 'VBPTtXIAl+/fxxhVUIUISLaH5OvYm1s9fLHLXAsE3N0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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