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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22541c9197941ec56f78917d4f922f74189bea87ac5fb98bac9fc79af37dd518' 
  AND token = 'dSVXVp/xeKuZ+J2uG9IR8wRtw9ULtfTLW7cwjRACkUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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