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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f102586b46bc9e4410784dbe9396e628789480c79d9737451b0c6d96b3ecb25c' 
  AND token = 'i0rdeiPXX1HAWHQTs1ybgPfHEkl2USIi8TzsDwez5aI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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