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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc63594d87fa37537c0b0bc2d6d63d06c57aac20ee47f7b9002e34097954dd59' 
  AND token = '194yKeIJo98oWTthhAJhrLmbw6wyJConQhsM74iP82A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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