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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15eebbaf5e1aa0704190fa490a17a2906fa0e1173f760b8c8472fb202419c3a0' 
  AND token = 'tlVg4awpFiizTGksdA83Ujm72Cxty+gpng33GJc2DPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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