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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '200408a235bc43635bb480f435c728da1f567e47c45cb4a5f6a37ee9e064d606' 
  AND token = 'raHX1ypDvfrdsmp5FeRd0ynQ5xQ0sAsmcvrvww7iKEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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