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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02629bb62c1e712d0f0e5bc6394e417397aaaaaee4dc19e712cb5ec0f193424c' 
  AND token = 'cB48pNjnUs/iGmCau+2l/8BrH4fpT+4Yco+vv0QV7zQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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