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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3b8d0928a103f20278f5da0d2e78a8314f9f6c58587071a2c8b4b2811fbeca7' 
  AND token = 'BC8DYfCvAw/3G8DM2DOdj132EgnzqnFt33nzcOXluH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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