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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57d41ccf3bb8a571531606f20ac09ebef03c994942df3b1c5a664fd28a7ec5e8' 
  AND token = 'hE/vfCnT1OG3P6PQ5Nf78pcGjU0KTBr0nqS16eR4TGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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