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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a025622e2dd234df98ab9914821ff6b9655bbf31d09b0b7b2389c70d01aa438' 
  AND token = 'hFTLs3OFcFdVnr2uAFeljl1jzG+112AmqhfamoKHK8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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