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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba67a2e196a8b108ea4a450883badac8107b0380588c293c470ed03583278997' 
  AND token = 'y3SBOCqvE3fA/I9jRgv4otXWinyCi2YQ06g/4zkjRZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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