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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '795e7fe765dceb6e51747cb1278f781f24494993e9f6fb7272796d5561051a5a' 
  AND token = 'AsMb3dCIXpbu2w3UR1DKC5ELv04PpDvb+9sAnoL1+C4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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