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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '452745e0837e74b3a3800c3adde9a68a0d6cbb49e6acc4dc249c0ff52aa14ffe' 
  AND token = 'Qy4LsecEJUCYSFbRtklDVxflPmsKeWnIR1MUB8It75w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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