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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c35a9710563233c8c7ee84557f71204630d08cfd71dc1f6e2ee80a4d52c696e7' 
  AND token = 'HOH2btjyanbvgXj/H82DrPqWx+3mftP94S1YxLCi6R4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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