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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '712371ca9275757abc5a69f2cbbefdf215305ba249144f97d284fb6aba13f9fb' 
  AND token = '5CRUGdJKk62orVRZsBbytJT0CTdmkfoqepe1q0Eq98g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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