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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02cca9070a2a3e0d8331d616f296e43e8b0c62da2429a0466193a78e208c9ab3' 
  AND token = 'fMG41ZmDtJUlNRws3fPBgvwVb//l3WV5kGvHYWeS84c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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