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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19638e3175551be84868ff20ee010eaa1fe741fedb86a94044b65060a7ac398f' 
  AND token = 'e/ZMuxhSuzPNhz14zzM36/65+MaETN39Y2BAaerHqK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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