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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '952dc10bbf77f95228df0701b0ec46c34b4743d87e03e9a5a51113b78868e899' 
  AND token = 'cY4ud4o3lB0PF+ZXiMnYTj21uUAAHxlw2KD8yda1Srs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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