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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56dbdbb939fc0d8853bb294f76d0a1a500d4d4153386ef2a5e35265bbe00c650' 
  AND token = 'gefUV/MXVx2lU4Sgiyak87URDOp9a5+yiX+AmzOSiOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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