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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edcbda9a8da9a17f466e050cb28a9427cd07d3c44a11a8ee7d08b8628ce92a4e' 
  AND token = 'vJocIQidFTN0mSTFOfs2FNzBsTilvXAIbyUx1wvMuwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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